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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ae999f07d44652403af253aecd270c95800defefafc4d098a5d5271f033960' 
  AND token = 'qh0AqM9JdoONIdVAhTK21WC762pVMCv28iFMrXYKoMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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