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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e14f5dc140faaac7a2a02ef7eaa37b56c3331b4904721e48a4870875f9b0fd' 
  AND token = '8K4GAhsNQoNYGmuvjjoF3EUyYOF+lLos5fIpeUUTwCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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