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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e937370bf90bc194d58ebcb1cb5c2e937b485d8760d5aba64f7e3092b82e00f5' 
  AND token = '/e1zN5XA4rcLFmCZZqTuqyiY3hZyYfL4T9qjpMW1iWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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