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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f30d4f4ba867f86c488c029f2848bc275dfbbf1f9134e2a7de237af0fee3bfc' 
  AND token = 'HNOvPgUCPybcaSsCKHzj2PVhVUUtDHI6fipPw5txbao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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