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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d12eaea395c2092580a924dca4b00a3ed4e027f78b6b99ce681e3dbece07e4' 
  AND token = 'MhPVeaDAW1+j4jTmZvhVn0d9as8sa371HQau2BFnJxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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