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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f22fcdb84c84c14710e05421177b6e50dfbafb2b97c569f3cfefdf84097699' 
  AND token = 'fP5NxS2mP2/nYKJc075QYntZk4Lte6JBtvPAC6vJ270=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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