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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954f1749142de1b13a07a2709e7c51f06b7f2ff6cc58ca038c55bab3d0328db8' 
  AND token = 'CTccWFfY7tP5kHxRVoNerOdwt+iIPQ8DMrmnZ3qOTwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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