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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc86871fa4fe3d2a40dac5154bdcb1545012777a58b14fb9514d7b94a62a0cb1' 
  AND token = 'Ho6X/rkCl9BOFWpqSF/pJmN7tB4T3Rzx2iEf0RMPY+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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