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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca65c3ffad28476a5cc0155bfdde6b56831fe608df61090eb12f150034834930' 
  AND token = 'P7GHjWn2dN3QhnREnDIRkWImMG/pyZ33sFefFFh6TbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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