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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d8838432df4a1be122d5e2a3b82102848093c467bef3fa6ef44bdee0012a78' 
  AND token = '7IufMhhMD0/3Ft4GRZJzi0+qt8KEx9h7c9Hf/1zoMtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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