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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5052c1a0f055953048e0e0b40d22f6e50fbdb3029f9ee6d380e695f8dfc1c37e' 
  AND token = 'y/5khjw08rIW+gwjsD3SK+agQuydSpuIKu815fO4/1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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