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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639798945c4321a55ee52a563608e04bff91625eee0befb8ea50ae078a0e6f39' 
  AND token = 'oMT1NOfOC1ofUi6e3KfJ+ITQGmakaXZ3Tc+0Km2fGos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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