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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55339f073063785f00a1444622da77960ad74a76b68a01b6b461532a84797205' 
  AND token = 'Qhw/Zcz0yWqcST68t9OQwB5vcUAcfAIkv08rVu9aN94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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