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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8cfa2b0f0888791991f4af90990e2a8614ac1e138ea7b03f6da85b37406d3a4' 
  AND token = '0Tng0lH/3+r/w4EgXf71K6XtXny53b5upfPGeCkoXnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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