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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89cb89002f171d3c414898eafcf16916b44fffd4c828c0cea44a528ebe92742b' 
  AND token = 'v2f/YDPpTTC6/pMH/0CewZ0A71sM2R9JG/+Y7JHugew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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