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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693e142e92e73bccba026def48d900e496f8525881427ee866def546c59a6dcb' 
  AND token = 'YjLGADMv/Sg25DOAEAWOD2PwYd7Jo6jqVcxe+6IaXy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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