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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cc11dd2e5ac56cb79801dd6b2f9ab8e83c732c8a2fec9fde0106cbdbeb5aef' 
  AND token = 'Xwf+TOJjK5OliS7DQRAzC0MY0yee7vmFY9rnnm1Vr0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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