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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb23656af327195f09170ba2e870979fad4ecd9f4b6ca05cccaa025a5280aec3' 
  AND token = 'TsXM93sY6c22GrPhYHoYOcMAn7N0P39wJvoQ0g24ePM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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