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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7978e4b6bbaf84b081f5a7b3519074a4ab6a8d1f322776abb9b6fb99fcd4da9' 
  AND token = '7Ap7E4tcDlim1kVywSS/wAS2n2pAmPh37iqvFOmf0ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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