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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b744d2a232163dad4694364ea393de62ce3fffcd356e34d01076b022c2d92c1f' 
  AND token = 'feZF/LAj1W2bv4GOBpV8vP0zoqiqHAOqZaTUBETLvFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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