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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbc8d9a1a5d3198e54b0706820bf5ade1660d22f9efab985b1b9bd1abc8ade8' 
  AND token = 'sCP6kRx31k//2u5Oo4ifM65Y8TCDwFxYZENcISQOPq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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