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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01ce52ebe85b89813f52e5340293aba2fcf93bebc436f67b53f7214d5a6e218' 
  AND token = 'T82Pm2d7p4n+K0HMk76K+VvcZjC6ZUescmQYosqeXBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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