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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ca75a5d3ff7e5f2a719d12b70dea69d5f934901e3a8a0a4dc8c83cbfc1bd7a' 
  AND token = 'oaSWw3q8a/U0MZ3IOZL0PTV/ifEWKm+S9prcJdqD8jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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