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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b3df3f236190dbdbd593b5c4eb108c7be018645eb95b89c27b0d0159ce4daa' 
  AND token = 'Lll/65Ihv/0dMWtYNApjH22GUE5vuTrR80i6N0PG//4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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