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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c60755cd67721d6e7d031d15457850e5d3e28fa02f7c6e4b718c764a8f7ff9' 
  AND token = 'x4I6+ntXEy+hg6no2Z0cEWtQZzyKHJEuA6ffjPJIcXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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