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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbbbb9ad3b6f9b3aabf831fc172dd774b7c12ac2613573660ed1102b2feff66' 
  AND token = 'bcmpMHDSHSu+HVkmn8kVnNdX4IhmicTo9LlVXXPsiEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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