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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6efd4e7b2c08aca6969732f309ae3d8a0c1c0aef11c44f02c29587fb8ff1620d' 
  AND token = 'qXQaYH3S5/Jqapr54XCYNjK+Dm5byagH8IhH2/Ak97Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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