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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19be01e294cb760d0050d404c499f6e74d4a65f2635b91792812d1d7669bf0ef' 
  AND token = 'XC3zu3e3u0IoMTDDLIixzTi25YYE8bYWQjdQ/EKBxBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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