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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27f9709fabdb47a3514e4f23362a71d54dd185fa7b9ce0de469bf3512084f5e' 
  AND token = '4TBqnXSwDR02gr7Tj8yDin7CXrw5tT8XkLCgx3tY4wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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