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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4cd4ea77f669bcd1a40c52ad7d7024e566fa0611ae84cde8868f36b04ba0a27' 
  AND token = 'M/sY9HCGb3ghfv/bpRCQAhAWIV2yZCwXwS459O0uGBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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