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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2522f16a51fc265148b07e399c7d570b2ac9ffde2b1cc1c28ec526a2b3a62912' 
  AND token = 'lIQZTV3CJJjZcAWksP+b4SsuwR+3t9WWzVo/b5XCBJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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