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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775477819b7a606391a5fff6b6b32f4cc074d3f4582f1688a00b1174c0118efc' 
  AND token = 'sP5uVZAQUkALT/cxAs1hB784ze6nA31u5yshmp3J9PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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