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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f382851cbd8d5503524baad20021d3a0af04bc0b8c5cd4a39140caf01fbf510c' 
  AND token = 'P58+JukDXAxoAtKyBY/raMhKSpjkrxC2ZxKqn7dwIzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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