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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a2f0b7b06b0078a8eeb4e7fe1b5869fca99429ef0be5b3d7f6badadc347abe' 
  AND token = 'ur6+AKtn+mfhF4swYFwxdaBaqyJ+yNg5DovnDBfAbVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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