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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86aba77de296d841d6d644a715d26c29d765d8254e80308d80209e4a015bb90b' 
  AND token = 'tRqx2J1MrlnEutQjX86dSRKntXl6q3FEG5zkIB5wiHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}