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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eeed402b34df6fa2ed2b241ef9a469280dc64c0b9b7d2f2a4c325db53927d26' 
  AND token = 'X+KL14vj2wVpqzu8RI+oZ2bBINXN2Zbe7AJvbZlQ++I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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