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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b6ba2f4fc921b4ff2dc36c7f92197a5f5d1d6d47aad7c7866304cdf3c3e988' 
  AND token = 'nW1Kr8NiYDgno4yUwQZQVtcLTQ/rtMAk7SzcA+rTSoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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