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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80d5aeec198693266624f6276ac21411f34251d5c6df622dc597b7aa019d3f15' 
  AND token = 'ovMXREvpwJoPn/WHrBHW3mxcVd6XcmGRrcLtLvxJeyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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