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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb6caec38e817c81b9b90e9cc83456d3ec3b256d09cf2e86e77ed07fe0b1b20' 
  AND token = '6Qvwmi3pJor5tuX4sWBhp45V5sztyRno9awoZYPEDBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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