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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4022f3a7419ff3198b0e4adfbe6962655aba622ae04e952c8870febdb0d6b38d' 
  AND token = 'ogC4GymUDIFl3Ffuv4Bl4MECJLwInk4Iozg46GGhhwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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