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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86b11d1935e2563ed440429b3a155228b7d3bd05a63caaf5c8826461a20e087' 
  AND token = 'GfUkGx3zDqZaezgh33SvKZ8B41LpwUUibiB5k6Hp7oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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