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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5490c8b00d6bfa2551d62084e195cfe4138da2f41e6637df2fe2e0603114da7' 
  AND token = '1kJ/reZs/O27EMMrtJlkljH2L91mopgUpeDYo7vMv/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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