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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a693714e3aee7c92c0b0377359f3d86c4d036c8fc172055d5e4a75bd8cd6fac9' 
  AND token = 'V3vOk0wHiHuvJwey9/zO8HHyD0PY0b6HVs7me5nF7XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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