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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c94c048d83e605d8a18681c6aba5d3b23d2731e3fc9bae5b1e4a093b0d5507c' 
  AND token = 'DhIvNHlB10gHNVOO7IBUL1RBZKM52bW4EQ5IPcosF+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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