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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e2c867a5787ad4bd5fb50a390d4a884434b96705633c9a5df1672a72a3c7a0' 
  AND token = 'Mjnvgo46mBWbzM4jASiROURr74o5ID1iu0zgIch/SGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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