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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68305cf046a19447da4d1d3c0419e3c68da5627b6915130964e4d22794d51f79' 
  AND token = '4nnZoBMH/32zjFMGiuD2dHUsY0pF6MMFNlNBAafMyG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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