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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475b1de23488e26ca6f135e9d3ba20b838992a6f2daca9ab8d8f85cb9fd5add4' 
  AND token = 'AWglYH22hOsY/OU4Q0EyKNATvhDDGR5eLeqhs1USLf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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