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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bea0fb0b6c574509947fc068c548375365e607ea28c4789539416a02cb5d6a2' 
  AND token = '1E4r5hLWq2KNAbpEeRL0CF0wkk/4H5LyrgHyy2ZWg0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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