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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10df00e895a4b91f3bb14705431990da651a83773d0b179626666ebfe287fa6' 
  AND token = 'F+m0l/Me147TTCY7Vy0VL0LViV30zprAjQojJbna1M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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