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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e1be170553ef7ee324f8e05b96339f94edc2292f2cde4f0506bfd59c140ace' 
  AND token = 'xtP9yljfsZyJIzf24WZjjzXtarYaaDV9/aYZOGMB6vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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