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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a958953e7982fd6931c3f636f77131d7959aa032340d0a1753e96235d301eab' 
  AND token = 'WSpII/3ix/2/9y/369tk78VUkyENcE24zu1XZrCeIUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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