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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f0d45424339799d739f02ffacad39770b95329967c59d49bbcfde20d571bc4' 
  AND token = 'khRrr6eNg41ci1cEOl9dfz5xutKdLPPemXeDKkflPiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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