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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5988704021fecdff93d68d776dc5526b21760468eb2e7fcda8535ce79c3e1189' 
  AND token = 'FUfJ99NhSVckfv3vK155+n/XqJvSCnSLtm7W6W/+lX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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