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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cadbb075da2d6c6f945017e08535afb823666d90e84685cf512513a576a26062' 
  AND token = 'Do/fjwALEu1ccXEm7FM4DrHMl0xpQJG3i6n5ZD2ZjwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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