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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67eefbd29b5a1ea777638393552905de0c8f7e2d3e7a202d903f895e9409926' 
  AND token = 'ppZni763e8MHWI3bqS6jj+DVpRY7EQlNL7MPNpMmdww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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