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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98b26808ef1a817882eabe8c23b04c8ea40b07d5571adc19ea08dee0373bf55' 
  AND token = 'Mm6/2xOdRvPiEl3FVNCHjpQYYomTdG/O9vIXRVZ3vR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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